macOS process library
What is photoanalysisd on Mac?
photoanalysisd is the macOS agent that analyzes your Photos library in the background. It powers Memories, People & Pets, and searching your photos for scenes and objects, such as “beach” or “dog”.
- Part of
- The macOS Photos library analysis agent.
- Safe?
- Yes. It is part of macOS and works on your Photos library on your Mac.
- Can I quit it?
- Not usefully. macOS starts it again and the analysis picks up where it left off.
The short answer
High CPU from photoanalysisd is normal after you import a lot of photos, create a new library, or update macOS. It is doing a one-time job, and it settles down when it finishes. Apple says it can take anywhere from a short time to a few days, depending on your library.
Normal use
What photoanalysisd usually looks like.
On a Mac whose library is already analyzed, photoanalysisd is usually idle, using little CPU and memory, and only does small amounts of work when new photos arrive.
After a big import or a macOS update, it can use a lot of CPU for hours. Apple notes that Photos on Mac does this analysis when you aren’t using the app, so it often runs while your Mac is otherwise quiet.
Why photoanalysisd uses so much CPU or memory
- A large import
Thousands of new photos, from a camera, an old drive, or iCloud Photos downloading to a new Mac, all need analysis.
- A macOS update
New versions of macOS can improve the analysis models, which may mean re-analyzing photos you already have.
- A new or rebuilt library
Starting a library from scratch, or repairing one, means analyzing everything again.
- Very large libraries
The bigger the library, the longer the job runs before it finishes.
How to calm photoanalysisd down
Start at the top. Each step is more disruptive than the one before.
- Let it finish
This is a one-time job for each batch of photos. Leave your Mac on and awake with Photos closed, and it usually settles within hours to a few days.
- Keep Photos closed while it works
Photos on Mac analyzes your library when you aren’t using the app, so leaving Photos open can stretch the process out.
- Stagger big imports
If you’re moving a huge library, importing it in batches spreads the analysis over time.
- Update macOS
Install pending updates in System Settings → General → Software Update, in case a fix applies to Photos analysis.
- Restart if it never settles
If it keeps running hard for many days with no new photos, restart your Mac. Save your work first.
Seeing it in Spare
Find what it’s reacting to.
photoanalysisd tends to start while you’re away. Spare’s recap window shows CPU and memory pressure for Today, This week, and the Last 7 days, and the “While you were away” summary tells you what was busy, so a fan that spun up overnight has an explanation.
Spare treats macOS processes like photoanalysisd as system tasks and never offers to stop them.
Common questions
About photoanalysisd
Is photoanalysisd a virus?
No. It is the macOS agent that analyzes your Photos library for Memories, People & Pets, and search.
How long does photoanalysisd take?
It depends on how many photos need analysis and what else your Mac is doing. Apple says it can be quick or take up to a few days.
Does photoanalysisd upload my photos?
The analysis runs on your Mac. If you use iCloud Photos, syncing is handled by separate processes.
Can I stop photoanalysisd permanently?
No. It is part of macOS. Letting it finish is the reliable way to make it quiet.
Related processes
Sources: photoanalysisd(8) man page, macOS, Apple: If you can’t find pets in the People & Pets album in Photos. Reviewed October 6, 2026.
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